The 2004 Scion xBs in this analysis were driven mostly on the highway at an average speed of 70 miles per hour (about 59 percent of the miles driven). The rest of the miles were in heavy traffic (11.8 percent), in the city (10.2 percent), and in the suburbs (0 percent).

In addition, the average 2004 Scion xB in this analysis was driven on flat terrain with a light foot and the AC not used at all.

2004 Scion xB Gas Mileage (MPG)

Unlike other fuel economy surveys, TrueDelta's Real-World Gas Mileage Survey includes questions about how and
where a car was driven. So you can get an idea of the Scion xB's
real-world MPG based on how and where you drive a car.